package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.sl.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;


    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //1.当前集合用于存放从begin到end范围内的每天的 日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算，计算指定日期的最后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //2.当前集合用于存放从begin到end范围内的每天的营业额
        List<Double> turnoverList = new ArrayList<>();//用于存放营业额
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指：状态为“已完成（5）”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            HashMap map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            //如果turnover（营业额）未查询到，数据库返回的是null，所以需自己讲空转为0.0
            turnover = turnover == null ? 0.0 : turnover;

            turnoverList.add(turnover);
        }

        //将List<LocalDate>转为String
        String joinLocalDate = StringUtils.join(dateList, ",");
        //将List<Double>转为String
        String joinDouble = StringUtils.join(turnoverList, ",");

        return TurnoverReportVO.builder()
                .dateList(joinLocalDate)
                .turnoverList(joinDouble)
                .build();
    }


    /**
     * 统计指定时间区间内的用户数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        //1.当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //2.存放每天的新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //3.存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {//循环日期，查询新增以及总数量，再添加到对应集合当中
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);//先查总数量

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间的订单数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {

        //1.当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //2.存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //3.存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天的订单总数，
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的订单总数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //4.计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //5.计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //6.计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {//分母不为0
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(validOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据条件统计订单数量
     *
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        HashMap map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        Integer count = orderMapper.countByMap(map);
        return count;
    }

    /**
     * 统计指定时间区间内的销量排名前10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     *
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response ) {
        //1.查询数据库，获取营业数据---查询最近30天数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateBnd = LocalDate.now().minusDays(1);
                //通过这种方式转变格式
        LocalDateTime begin = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(dateBnd, LocalTime.MAX);
                //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);

        InputStream in = this.getClass()
                .getClassLoader()
                .getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模版文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheetAt(0);

            //填充数据-时间
            sheet.getRow(1).getCell(1)
                    .setCellValue("时间："+dateBegin+"至"+dateBnd);

            //填充数据-营业额
            sheet.getRow(3).getCell(2)
                    .setCellValue(businessDataVO.getTurnover());

            //填充数据-订单完成率
            sheet.getRow(3).getCell(4)
                    .setCellValue(businessDataVO.getOrderCompletionRate());

            //填充数据-新增用户数
            sheet.getRow(3).getCell(6)
                    .setCellValue(businessDataVO.getNewUsers());

            //填充数据-有效订单数
            sheet.getRow(4).getCell(2)
                    .setCellValue(businessDataVO.getValidOrderCount());

            //填充数据-平均客单价
            sheet.getRow(4).getCell(4)
                    .setCellValue(businessDataVO.getUnitPrice());


            //填充明细数据（30天的）
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获取某一行
                Row row = sheet.getRow(7+ i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }

            //3.通过输出流将Excel文件下载到客户端游览器
            ServletOutputStream out = response .getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (Exception e) {
           e.printStackTrace();
        }

    }
}
